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6991738 
Journal Article 
Dry-wet spinning of temperature-sensitive PVDF hollow-fiber membranes at different bore fluid flow rates 
Shen, X; Zhao, Y; Zhang, Q; Chen, Li; , 
2013 
Yes 
Journal of Polymer Research
ISSN: 1022-9760 
SPRINGER 
DORDRECHT 
20 
5 
WOS:000318283700012 
In this work, dry-wet spinning was conducted to fabricate poly(vinylidene fluoride)-g-poly(N-isopropylacrylamide) (PVDF-g-PNIPAAm) copolymer hollow-fiber membranes. The effect of the bore fluid flow rate (BFFR) on the structure and performance of each hollow-fiber membrane was investigated by X-ray photoelectron spectros-copy (XPS), field emission scan electronic microscopy (FESEM), pore-size measurements, mechanical property evaluations, and a filtration experiment. It was found that the grafted PNIPAAm chains aggregated on the inner surface of the fiber membrane due to the effect of the bore fluid. When the permeation temperature was increased from 20 to 45 degrees C, a drastic reduction in the pure-water flux and a remarkable increase in the retention of bovine serum albumin (BSA) were observed at around 32 degrees C, indicating that the as-prepared fiber membranes exhibit excellent temperature sensitivity. Pore-size measurements confirmed that both the mean pore size and the porosity increase with increasing BFFR, endowing the fiber membranes with high pure-water fluxes and low retentions of BSA. 
Poly(vinylidene fluoride); Poly(N-isopropylacrylamide); Hollow-fiber membrane; Temperature-sensitive; Bore fluid flow rate 
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